MELODY HOFFMAN of Minneapolis describes herself on her blog as an “urban bicycle scholar, critical feminist, community engagement professor.” Her book Bike Lanes are White Lanes discusses how seemingly benign cycle infrastructure can ring alarm bells with some black communities, why cycle advocacy can sometimes shout “white privilege”, and how “invisible riders” get neither recognition nor cycle facilities. (To grab a discount on Melody’s book type in 6as16 for 30 percent off at the University of Nebraska book store.)

CHRIS OLIVER is a professor of medicine and tweets as @CyclingSurgeon. He is a consultant orthopaedic trauma surgeon at the Royal Infirmary of Edinburgh, and also advises the Scottish government on active travel. Once morbidly obese he lost 168lbs (76 kilos) and took up cycling to keep fit. He has ridden Lands End to John o’Groats, and with his daughter, he has also ridden coast to coast across America.